CVE-2026-33141 chamilo CVE debrief

Who should care

Defenders responsible for Chamilo LMS deployments, especially those with authenticated user access, should assess exposure and prioritize verification of instance updates to version 2.0.0-RC.3 or later.

Why it matters

CVE-2026-33141 is a medium-severity vulnerability in Chamilo LMS that allows authenticated users to access sensitive user data. Defenders should prioritize verifying exposure and implementing additional monitoring to prevent potential exploitation.

• Potential unauthorized access to sensitive user data
• Possible disruption of learning progress tracking
• Need for verification of instance updates to prevent exploitation

Technical summary

CVE-2026-33141 is an Insecure Direct Object Reference (IDOR) vulnerability in the REST API stats endpoint of Chamilo LMS. The vulnerability allows any authenticated user, including low-privilege students, to read any other user's learning progress, certificates, and gradebook scores for any course, without enrollment or supervisory relationship. The issue was fixed in version 2.0.0-RC.3. Defenders should prioritize verifying exposure of Chamilo LMS instances to authenticated users and assess the impact of potential unauthorized access to sensitive user data.

Defensive priority

Defenders should prioritize verifying exposure of Chamilo LMS instances to authenticated users, especially those with low privileges, and assess the impact of potential unauthorized access to sensitive user data.

Recommended defensive actions

• Verify Chamilo LMS instances are updated to version 2.0.0-RC.3 or later
• Assess exposure of Chamilo LMS instances to authenticated users
• Implement additional monitoring for potential unauthorized access to sensitive user data
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and the fixed version. However, additional information on potential exploitation or affected deployments is limited. Defenders should verify the vulnerability's impact on Chamilo LMS instances and assess the exposure of authenticated users. Limited source detail is available, so defenders should focus on verifying instance updates and implementing additional monitoring.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.